October 2011 Doc ID 2167 Rev 4 1/18
18
LM137
LM337
Three-terminal adjustable negative voltage regulators
Features
■Output voltage adjustable down to VREF
■1.5 A guaranteed output current
■0.3%/V typical load regulation
■0.01%/V typical line regulation
■Current limit constant with temperature
■Ripple rejection: 77 dB
■Standard 3-lead transistor packages
■Excellent thermal regulation: 0.002%/V
■50 ppm/°C temperature coefficient
Description
The LM137 series are adjustable 3-terminal
negative voltage regulators capable of supplying
in excess -1.5 A over a -1.2 to -37 V output
voltage range. They are exceptionally easy to use
and require only two external resistors to set the
output voltage. Further, both line and load
regulation are better than standard fixed
regulators. Also, LM137 regulators are supplied in
standard transistor packages which are easily
mounted and handled. In addition to higher
performance than fixed regulators, the LM137
series offer full overload protection available only
in integrated circuits. Included on the chip are
current limit, thermal overload protection and safe
area protection. All overload protection circuitry
remains fully functional even if the adjustment
terminal is disconnected.
TO-220 TO-3
Table 1. Device summary
Part numbers Order codes Packages Temperature range
LM137 LM137K TO-3 - 55 °C to 150 °C
LM337 LM337K TO-3 0 °C to 125 °C
LM337 LM337SP TO-220 0 °C to 125 °C
www.st.com
Contents LM137, LM337
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Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
LM137, LM337 Diagram
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1 Diagram
Figure 1. Schematic diagram
Pin configuration LM137, LM337
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2 Pin configuration
Figure 2. Pin connections (top view)
TO-220 TO-3
LM137, LM337 Maximum ratings
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3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
VI - VOInput output voltage differential 40 V
IOOutput current 1.5 A
PDPower dissipation Internally limited
TSTG Storage temperature range - 65 to 150 °C
TOP Operating junction temperature range LM137 - 55 to 150 °C
LM337 0 to 125
Table 3. Thermal data
Symbol Parameter TO-220 TO-3 Unit
RthJC Thermal resistance junction-case max. 3 4 °C/W
RthJA Thermal resistance junction-ambient max. 70 35 °C/W
Electrical characteristics LM137, LM337
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4 Electrical characteristics
TJ = -55 to 150 °C, VI - VO = 5 V, IO = 0.5 A unless otherwise specified.
TJ = 0 to 150 °C unless otherwise specified.
Table 4. Electrical characteristics of LM137
Symbol Parameter Test conditions Min. Typ. Max. Unit
VREF Reference voltage
Ta = 25°C -1.225 -1.25 -1.275
V
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax
|IO| = 10mA to |IO(max)| P ≤ Pmax
-1.2 -1.25 -1.3
KVI Line regulation (1) Ta = 25°C
|VI - VO| = 3 to 40 V
IO = 0.1 A 0.01 0.02 %/V
IO = 20 mA 0.01 0.02
KVO Load regulation (1) Ta = 25°C
|IO| = 10mA to |IO(max)|
|VO| ≤ 5 V 15 25 mV
|VO| ≥ 5 V 0.3 0.5 %
Thermal regulation Ta = 25°C, pulse 10 ms 0.002 0.02 %/W
IADJ Adjustment pin current 65 100 µA
ΔIADJ
Adjustment pin current
change
Ta = 25°C, |IO| = 10 mA to |IO(max)|
|VI - VO| = 3 to 40 V 25µA
KVI Line regulation (1) |VI - VO| = 3 to 40 V 0.02 0.05 %/V
KVO Load regulation (1) |IO| = 10mA to |IO(max)||VO| ≤ 5 V 20 50 mV
|VO| ≥ 5 V 0.3 1 %
|IO(min)| Minimum load current |VI - VO| ≤ 40 V 2.5 5 mA
|VI - VO| ≤ 10 V 1.2 3
IOS Short circuit output current |VI - VO| ≤ 15 V 1.5 2.2 A
|VI - VO| = 40 V, TJ =25°C 0.24 0.4
VNO
RMS output noise
(% of VO)Ta = 25°C, f = 10 Hz to 10 kHz 0.003 %
RVF Ripple rejection ratio VO = -10 V, f = 120 Hz 60 dB
CADJ = 10 µF 66 77
KVT Temperature stability 0.6 %
KVH Long term stability Ta = 125°C, 1000 H 0.3 1 %
1. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output
voltage due to heating effects are covered under the specification for thermal regulation.
LM137, LM337 Electrical characteristics
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Table 5. Electrical characteristics of LM337
Symbol Parameter Test conditions Min. Typ. Max. Unit
VREF Reference voltage
Ta = 25°C -1.213 -1.25 -1.287
V
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax
|IO| = 10mA to |IO(max)|, P ≤ Pmax
-1.2 -1.25 -1.3
KVI Line regulation (1) Ta = 25°C
|VI - VO| = 3 to 40 V
IO = 0.1 A 0.01 0.04 %/V
IO = 20 mA 0.01 0.04
KVO Load regulation (1) Ta = 25°C
|IO| = 10mA to |IO(max)|
|VO| ≤ 5 V 15 50 mV
|VO| ≥ 5 V 0.3 1 %
Thermal regulation Ta = 25°C, pulse 10 ms 0.003 0.04 %/W
IADJ Adjustment pin current 65 100 µA
ΔIADJ
Adjustment pin current
change
Ta = 25°C, |IO| = 10 mA to |IO(max)|
|VI - VO| = 3 to 40 V 25µA
KVI Line regulation (1) |VI - VO| = 3 to 40 V 0.02 0.07 %/V
KVO Load regulation (1) |IO| = 10mA to |IO(max)||VO| ≤ 5 V 20 70 mV
|VO| ≥ 5 V 0.3 1.5 %
|IO(min)| Minimum load current |VI - VO| ≤ 40 V 2.5 10 mA
|VI - VO| ≤ 10 V 1.5 6
IOS Short circuit output current |VI - VO| ≤ 15 V 1.5 2.2 A
|VI - VO| = 40 V, TJ =2 5°C 0.15 0.4
VNO
RMS output noise
(% of VO)Ta = 25°C, f = 10 Hz to 10 kHz 0.003 %
RVF Ripple rejection ratio VO = -10 V, f = 120 Hz 60 dB
CADJ = 10 µF 66 77
KVT Temperature stability 0.6 %
KVH Long term stability Ta = 125°C, 1000 H 0.3 1 %
1. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output
voltage due to heating effects are covered under the specification for thermal regulation.
Typical characteristics LM137, LM337
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5 Typical characteristics
Figure 3. Load regulation Figure 4. Current limit
Figure 5. Adjustment current Figure 6. Dropout voltage
Figure 7. Temperature stability Figure 8. Minimum operating current
LM137, LM337 Typical characteristics
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Figure 9. Ripple rejection vs. output voltage Figure 10. Ripple rejection vs. frequency
Figure 11. Ripple rejection vs. output current Figure 12. Output impedance
Figure 13. Line transient response Figure 14. Load transient response
Thermal regulation LM137, LM337
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6 Thermal regulation
When power is dissipated in an IC, a temperature gradient occurs across the IC chip
affecting the individual IC circuit components. With an IC regulator, this gradient can be
especially severe since power dissipation is large.
Thermal regulation is the effect of these temperature gradients on output voltage (in
percentage output change) per watt of power change in a specified time. Thermal regulation
error is independent of electrical regulation or temperature coefficient, and occurs within 5
ms to 50 ms after a change in power dissipation. Thermal regulation depends on IC layout
as well as electrical design. The thermal regulation of a voltage regulator is defined as the
percentage change of VO, per watt, within the first 10ms after a step of power, is applied.
The LM137 specification is 0.02%/W max. In Figure 1, a typical LM337’s output drifts only 3
mV for 0.03% of VO = – 10 V) when a 10 W pulse is applied for 10 ms. This performance is
thus well inside the specification limit of 0.02%/W x 10 W = 0.2% max. When the 10 W pulse
is ended the thermal regulation again shows a 3 mV step as the LM137 chip cools off. Note
that the load regulation error of about 8 mV (0.08%) is additional to the thermal regulation
error.
In Figure 2, when the 10 W pulse is applied for 100 ms, the output drifts only slightly beyond
the drift in the first 10 ms and the thermal error stays well within 0.1% (10 mV).
LM137, LM337 Typical application
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7 Typical application
* C1 = 1 µF solid tantalum or 10 µF aluminium electrolytic required for stability.
** C2 = 1 µF solid tantalum is required only if regulator is more than 10 cm from power supply filter capacitors
* The 10 µF capacitors are optimal to improve ripple rejection.
Figure 15. Adjustable negative voltage regulator
Figure 16. Adjustable lab voltage regulator
Typical application LM137, LM337
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* When CL is larger than 20 µF, D1 protects the LM137 in case the input supply is shorted.
** When C2 is larger than 10 µF and VO is larger than - 25 V, D2 protects the LM137 in case the output is
shorted.
Figure 17. Current regulator
Figure 18. Negative regulator with protection diodes
LM137, LM337 Typical application
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Figure 19. - 5.2 V regulator with electronic shutdown (1)
1. Minimum output = - 1.3 V when control input is low.
Figure 20. Current regulator
Package mechanical data LM137, LM337
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8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
LM137, LM337 Package mechanical data
Doc ID 2167 Rev 4 15/18
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 4.40 4.60 0.1730.181
C1.231.32 0.0480.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E0.490.70 0.0190.027
F 0.61 0.88 0.024 0.034
F1 1.14 1.70 0.044 0.067
F2 1.14 1.70 0.044 0.067
G4.95 5.15 0.194 0.203
G1 2.4 2.7 0.094 0.106
H2 10.0 10.40 0.393 0.409
L2 16.4 0.645
L4 13.0 14.0 0.511 0.551
L5 2.65 2.95 0.104 0.116
L6 15.25 15.75 0.600 0.620
L7 6.2 6.6 0.244 0.260
L93.5 3.93 0.137 0.154
DIA. 3.75 3.85 0.147 0.151
TO-220 mechanical data
P011C
Package mechanical data LM137, LM337
16/18 Doc ID 2167 Rev 4
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 11.85 0.466
B0.96 1.05 1.10 0.037 0.041 0.043
C 1.70 0.066
D8.7 0.342
E 20.0 0.787
G 10.90.429
N 16.90.665
P 26.2 1.031
R3.88 4.090.152 0.161
U39.5 1.555
V30.10 1.185
TO-3 mechanical data
P003C/C
E
B
R
C
D
A
P
G
N
V
U
O
LM137, LM337
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